﻿#region Copyright (c) 2010 S. van Deursen
/* The Simple Injector is an easy-to-use Inversion of Control library for .NET
 * 
 * Copyright (C) 2010 S. van Deursen
 * 
 * To contact me, please visit my blog at http://www.cuttingedge.it/blogs/steven/ or mail to steven at 
 * cuttingedge.it.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
 * associated documentation files (the "Software"), to deal in the Software without restriction, including 
 * without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
 * copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the 
 * following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or substantial 
 * portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT 
 * LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO 
 * EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#endregion

namespace Framework.Common.Ioc.Extensions.Decorators
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Linq.Expressions;
    using Framework.Common.Ioc.Lifestyles;

    // A list of all decorators applied to a given service type.
    internal sealed class ServiceTypeDecoratorInfo
    {
        private readonly Type registeredServiceType;
        private readonly List<DecoratorInfo> appliedDecorators = new List<DecoratorInfo>();

        internal ServiceTypeDecoratorInfo(Type registeredServiceType, Type implementationType,
            InstanceProducer originalProducer)
        {
            this.registeredServiceType = registeredServiceType;
            this.ImplementationType = implementationType;
            this.OriginalProducer = originalProducer;
        }

        internal Type ImplementationType { get; private set; }

        internal InstanceProducer OriginalProducer { get; private set; }

        internal IEnumerable<DecoratorInfo> AppliedDecorators
        {
            get { return this.appliedDecorators; }
        }

        internal InstanceProducer GetCurrentInstanceProducer()
        {
            return this.AppliedDecorators.Any() ? this.AppliedDecorators.Last().DecoratorProducer : this.OriginalProducer;
        }

        internal void AddAppliedDecorator(Type decoratorType, Type originalImplementationType,
            Container container, Lifestyle lifestyle, Expression decoratedExpression)
        {
            var registration = new ExpressionRegistration(decoratedExpression, originalImplementationType,
                lifestyle, container);

            var producer = new InstanceProducer(this.registeredServiceType, registration);

            this.appliedDecorators.Add(new DecoratorInfo(decoratorType, producer));
        }
    }
}